(I also think this supposed saying is quite hokey and dumb. The earth is as much 'made of stars' as we are.)

"Bolje vrabac u ruci, nego golub na grani" means "better to have a sparrow in your hand than a pidgeon in a tree." Far less poetic than the native English bird-holding proverb "a bird in the hand is worth two in the bush" (which sounds strange when translated to Serbian as well -- "ptica u ruci vredi dve ptice u šumi", despite the fact it happens to rhyme).

Proverbs and sayings have a specific kind of poetry in their native language which doesn't survive translation. It seems much more likely to me that it was simply misattributed.